129 lines
3.7 KiB
Plaintext
129 lines
3.7 KiB
Plaintext
#import "modules/std.sx";
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#import "modules/math";
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#import "ui/types.sx";
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#import "ui/events.sx";
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GesturePhase :: enum {
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possible;
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began;
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changed;
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ended;
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cancelled;
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failed;
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}
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// --- TapGesture ---
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TapValue :: struct {
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location: Point;
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count: s32;
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}
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TapGesture :: struct {
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count: s32;
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on_tap: ?Closure();
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phase: GesturePhase;
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tap_count: s32;
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start_position: Point;
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TAP_THRESHOLD :f32: 10.0;
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handle_event :: (self: *TapGesture, event: *Event, frame: Frame) -> bool {
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if event.* == {
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case .mouse_down: (d) {
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if frame.contains(d.position) {
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self.phase = .began;
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self.start_position = d.position;
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return true;
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}
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}
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case .mouse_moved: (d) {
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if self.phase == .began {
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if self.start_position.distance(d.position) > TapGesture.TAP_THRESHOLD {
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self.phase = .failed;
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}
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}
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}
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case .mouse_up: (d) {
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if self.phase == .began {
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if frame.contains(d.position) {
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self.tap_count += 1;
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if self.tap_count >= self.count {
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if handler := self.on_tap { handler(); }
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self.tap_count = 0;
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}
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}
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}
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self.phase = .possible;
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return true;
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}
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}
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false;
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}
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}
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// --- DragGesture ---
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DragValue :: struct {
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location: Point;
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start_location: Point;
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translation: Point;
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}
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DragGesture :: struct {
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min_distance: f32;
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on_changed: ?Closure(DragValue);
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on_ended: ?Closure(DragValue);
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phase: GesturePhase;
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start_location: Point;
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current_location: Point;
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make_value :: (self: *DragGesture) -> DragValue {
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DragValue.{
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location = self.current_location,
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start_location = self.start_location,
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translation = self.current_location.sub(self.start_location)
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};
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}
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handle_event :: (self: *DragGesture, event: *Event, frame: Frame) -> bool {
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if event.* == {
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case .mouse_down: (d) {
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if frame.contains(d.position) {
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self.phase = .possible;
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self.start_location = d.position;
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self.current_location = d.position;
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return true;
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}
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}
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case .mouse_moved: (d) {
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if self.phase == .possible {
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self.current_location = d.position;
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if self.start_location.distance(d.position) >= self.min_distance {
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self.phase = .began;
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if handler := self.on_changed { handler(self.make_value()); }
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}
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return true;
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}
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if self.phase == .began or self.phase == .changed {
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self.current_location = d.position;
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self.phase = .changed;
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if handler := self.on_changed { handler(self.make_value()); }
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return true;
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}
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}
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case .mouse_up: (d) {
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if self.phase == .began or self.phase == .changed {
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self.current_location = d.position;
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self.phase = .ended;
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if handler := self.on_ended { handler(self.make_value()); }
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self.phase = .possible;
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return true;
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}
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self.phase = .possible;
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}
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}
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false;
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}
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}
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